Centrifugal separator



Apnl 23, 1940. G. H. ANDERssoN CENTRIFUGAL SEPARATOR Filed Sept. 9, 1937Patented Apr. 23, 1940 CETRIFUGAL SEPARATOR Gustav Harry Andersson,Appelviken, Sweden, assigner to The De Laval Separator Company, NewYork, N. Y., a corporation of New Jersey Application September 9, 1937,Serial No. 162,986 In Germany October 17, 1936 1 Claim.

This invention relates to centrifugal separators in which the lighterliquid is discharged by a stationary paring device projecting into thebowl during operation.

In centrifugal separators of this type it has been customary to use anopen outlet for the heavier liquid, which outlet is located below thechamber containing the paring device. The outlet in this case is throughan opening which can be regulated by a screw or the like.

For certain purposes, however, it is desirable to use an outlet in theform of a level outlet, the radius of the free surface of liquiddetermined thereby being controlled by an exchangeable so-calledregulating disc. It is, of course, possible to arrange such a regulatingdisc below the parer chamber, i. e., between this chamber and theseparating chamber. In such a case, however, either the inner diameterof the disc must be so great that the disc can be put in place over theouter wall of the parer chamber, or the parer chamber must be detachablysecured to the centrifugal bowl. And since the radius of the liquidsurface is determined by the diameter of the outlet in the regulatingdisc, the rst alternative results in unnecessarily great powerconsumption; while the second alternative presents an exceedinglydifficult and troublesome problem from the standpoint of manufacture andoperation.

In accordance with the invention, these difeulties are avoided byproviding a level outlet for the heavier liquid above the parer chamberand thus axially outside the paring discharge device.

The accompanying drawing shows several embodiments of the invention.

Fig. l is a fragmentary section view through a centrifugal separatordesigned in accordance with this invention; and

Fig. 2 is a detail sectional view showing a modied type of outlet forheavier liquid.

Referring to Fig. 1, the paring device comprises a parer disc I,enclosed by a paring chamber 2 arranged in and rotating with the bowl.The lighter liquid flows into the chamber 2 through a central opening 3,communicating with the inner part of the separating chamber 4 of thebowl. From the outer part of the separating chamber channels 5 extend tothe upper edge of the bowl neck above the chamber 2 and are partlyclosed at the top by an exchangeable annular regulating disc 1 from therim 8 of which the liquid is thrown into a collecting chamber, notshown, in the hood of the bowl.

The chamber 2 is located in that member which separates the Separatingchamber from the channels 5. As shown in the figure, the lower wall I Imay be removably secured to the rest of chamber 2. The'paring disc Imay,if desired, be provided with a number of vertical channels I2,`

fixed pipe lines through the hinge of the cover,

in known manner.

Referring to Fig. 2, which shows a modified type of outlet, the lighterliquid flows into the chamber 2 through a plurality of openings 3 in themember y II', which openings are desirably positioneds'ufliciently nearthe bowl axis to form `a level outlet for the lighter liquid,rso thatits free surface in the parer chamber 2 has a greater radius than in thechamber Il. The channels 5f lead from the outer part of the separatingchamber I vtoa chamber 6 positioned above the chamber 2 and bounded atthe top by an upwardly dished regulating disc l', from the rim 8 ofwhich the heavier liquid is thrown intoa col.I

lecting chamber formed by the hood'9 covering the separator bowl, and alid I0 provided there'- above.

In the construction shown in Fig. 1, if the lighter liquid' shouldoverflow the chamber 2 it would discharge into the collecting chamberfor the heavier liquid and be mixed therewith. This contingency isprevented by thev structure shown in Fig. 2, where the upper wall of thechamber 2 is provided with an upwardly projecting neck I5, over whichany overilow from the chamber 2 is discharged into a special collectingchamber,

not shown. v

In the bottom of the bowl 4 drain channels II are provided, the innerorifices of which are ordinarily situated inside the level of theliquid, but which act as overflowl channels when the sludge space of thebowl is filled with solid matter which clogs the normal path of flowthrough stantially consists of an arm I'I which, in known manner, isaxially movable and is provided with a screw I8, which is screwed into athread I9 in the central part of the bowl, the screw being introducedthrough the inlet tube 20 which is built integrally with the paring discI. The arm I'I is provided with a downwardly projecting skirt 2|, whichrests on the upper portion of the bowl and guides it in relation to thearm I1.

What I claim and desire to protect by Letters Patent is:

A centrifugal separator comprising a bowl having an upwardly extendingneck portion and, extending inwardly therefrom, members forming theupper and lower walls of a lighter liquid parer chamber, a stationaryparing device extending into said parer chamber, there being an openingin the lower of said walls communicat- `-vchannel for heavier separatedliquid communieating with the outer zone of the bowl and located in saidneck portion and extending to an open space above the parer chamber, andan exchangeable regulating disc extending from said neck portioninwardli7 above said space and forming a level outlet for the heavierseparated liquid.

GUSTAV HARRY ANDERSSON.

